Credit howtos/tuts authors (#264)

tutorials/tut0.rst

@@ -3,6 +3,8 @@
 Tutorial 0 - Get it Running
 ===========================
 
+:author: `begriffs <https://github.com/begriffs>`_
+
 Welcome to PostgREST! In this pre-tutorial we're going to get things running so you can create your first simple API.
 
 PostgREST is a standalone web server which turns a PostgreSQL database into a RESTful API. It serves an API that is customized based on the structure of the underlying database.

tutorials/tut1.rst

@@ -3,6 +3,8 @@
 Tutorial 1 - The Golden Key
 ===========================
 
+:author: `begriffs <https://github.com/begriffs>`_
+
 In :ref:`tut0` we created a read-only API with a single endpoint to list todos. There are many directions we can go to make this API more interesting, but one good place to start would be allowing some users to change data in addition to reading it.
 
 Step 1. Add a Trusted User